Super Hexagon - insanely difficult game from Terry Cavanaugh (maker of VVVVVV; my best survival time on the easiest difficulty is 3.56s so far. :P) (soundtrack included)

Dungeon Defenders - co-op tower defense. Includes all DLC. A bit of an iffy inclusion - it's *HUGE*, though, at 6GB on the PC (no idea what the Android version weighs in at, certainly not the 10MB that Humble's showing), and its best multiplayer days are definitely in the past, if you have no friends to play with. (soundtrack included)

Other than Dungeon Defenders, which might be too much for most Android tablets to handle, it's a solid bundle. And remember, part of your purchase goes to the EFF and Child's Play charities, as usual.